| http://www.w3.org/ns/prov#value | - In certain embodiments, the acidic material and/or acid generating material can be used in an amount from 0.01 to 5 % by weight, based on the total weight of the composition. [0052] The radiation diffraction material produced according to the invention may be used in marking devices, including documents of value, articles of manufacture and their packaging, and credentials documents, particularly
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